Solubility Calculations of Methane and Ethane in Aqueous Electrolyte Solutions

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Abstract

Accurate calculation of light hydrocarbon solubilities in aqueous electrolyte solutions is critical for petroleum and geochemical applications. However, very few electrolyte Equations of State (e-EoS) have been used for calculation of light hydrocarbon solubilities. Thermodynamic calculation of gas (methane and ethane) solubilities in aqueous solutions of chloride salts are presented. This work introduces a new parameter estimation approach (which can predict well the liquid densities of aqueous solutions) for the electrolyte Cubic Plus Association EoS (e-CPA). The cation/anion-water interaction parameters are obtained from the regression of experimental mean ionic activity coefficients and liquid densities. The results show that the e-CPA with the new parameter estimation approach gives good agreements with the corresponding experimental data. The cation/anion-gas interaction parameters are obtained from the regression of experimental gas solubilities. The results show that the e-CPA with the new parameter estimation approach correlates the gas solubilities reasonably well. The gas dissolution mechanisms and salting effects are extensively analyzed and discussed for a deeper understanding of gas dissolution in aqueous electrolyte solutions.
Original languageEnglish
JournalJournal of Solution Chemistry
Volume50
Issue number6
Pages (from-to)920-940
ISSN0095-9782
DOIs
Publication statusPublished - 2021

Keywords

  • Gas solubility
  • Light hydrocarbon gases
  • Aqueous electrolyte solution
  • Electrolyte equation of state

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